get-adgroupmember does not get members of the domain\Administrators group

windows 2008 forest using adws on dc's
powershell 2 running windows 7 box console , ide

not finding on web issue there not appear to error.
when using get-adgroupmember -identity "cn=administrators,cn=builtin,dc=####,dc=#######,dc=com" or get-adgroupmember -identity administrators

i this:

get-adgroupmember : operation completed successfully
@ line:1 char:18
+ get-adgroupmember <<<<  -identity "cn=administrators,cn=builtin,dc=####,dc=######,dc=com"
    + categoryinfo          : notspecified: (cn=administrato...######,dc=com:adgroup) [get-adgroupmember], adexception
    + fullyqualifiederrorid : operation completed successfully,microsoft.activedirectory.management.commands.getadgroupmember

works find when getting members of domain admins group (get-adgroupmember -identity "domain admins") and others. running these cmdlet using domin admin rights.

anyone seen before?

hi,

is root domain controller windows server 2008 r2? based on test, get-adgroupmember works fine on windows server 2008 r2 root dc.

if possible, please try test on windows server 2008 r2 test machine , let know result.

thanks.

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